Action: Relieves dryness, lubrication and replenishment of moisture in the mouth. Soothes tissues, while cleansing and protecting the mouth from caries and bacterial plaque. Causes of dry mouth: Age. Immune system disorders. The use of tobacco. The use of alcohol. Stress, anxiety or depression. Medicines. Symptoms or signs of dry mouth: Burning sensation in the tongue. Difficulty eating. Difficulty swallowing or speaking. Cracked lips. Increased cavities and gingivitis.